is higher endurance also higher recovery ?
Yes, this is true. It's easy to test in Mids by toggling accolades on/off. You can also check in-game that your base recovery is the same 1.67%/sec on a character with and without accolades.
Yes, increasing you total endurance will increase your rate of recovery.
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"Recovery" is a bit of a point of confusion because it means one thing and people use it in a sentence to refer to something else.
What It Means
Your HP and Endurance are both replenished in chunks of 5% of their maximum value. This is a fixed amount and cannot be changed. By buffing Regeneration or Recovery, you are in fact shortening the amount of time between those 5% chunks. The default interval for HP chunks is 12s (4 minutes for 100%), and Endurance is 3s (1 minute for 100%).
How People Use It
The end result of higher Regeneration or Recovery is more HP or Endurance replenished over time, usually expressed as a per-second figure. So in the case of Recovery, while it literally refers to the amount of time between 5% replenishes, people use the word to describe the "endurance per second" refill rate.
The Math
By default, you'll have 100 Endurance and a 3-second Recovery interval. This results in 100 Endurance refilled over 60s, which comes out to 1.66 endurance-per-second. Players refer to this as "base Recovery."
Say you get a 5% Recovery buff. This turns that 3s interval into 3 / (1 + 0.05) = 2.85s. At 100 Endurance, it will take 57.14s for a full refill, meaning 1.75 endurance/sec.
Now let's say that instead, you get a 5% Endurance buff, meaning 105 Endurance with a 3s interval. So over 60s, you refill 105 Endurance. This comes out to, surprise surprise, 1.75 endurance/sec.
Strictly speaking, equivalent Recovery and Endurance buffs will result in the same amount of Endurance being refilled per second. The difference is that with Recovery it fills to 100% faster, and with Endurance it lasts longer. But don't let that fool you: it's the same amount of Endurance per second, and since we get Stamina now, Endurance buffs will almost always be better than Recovery buffs in practice.
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Another way to look at it is that increasing your endurance is a direct multiplier of your recovery.
Starting at base: doubling your endurance is equal to doubling your recovery (100% recovery buff).
However, since it acts as a multiplier when you have both it gets even better:
If you had double the endurance with 100% recovery it would be the same as having normal endurance with 400% recovery.
If you had to chose between 10% +Recovery and 10% +Endurance, both would increase Recovery the same amount (by 10%). But, they're not exactly equal because +Endurance gives you simply more Endurance to use up on top of the increased rate of Recovery.
If you could allocate that 10% and split them up between +Endurance and +Recovery, then you get a higher rate of Recovery by splitting it evenly 5%/5% because the two mechanics are multiplicative of each other (you get an additional 5% of 5% on top of the 10% overall rate of Recovery increase, which isn't much until you get into much higher numbers such as what Ultimus is using above... which one isn't likely to see for +Endurance except maybe as a temporary buff).
In general, go for +Endurance, but don't spurn +Recovery when +Endurance isn't available.
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There's a few sets you can get both +recovery and +max endurance out of. Gift of the Ancients (defense) and Impervium armor (resistance) are two of them; there's also a pet set and a slow set. I've used 4 pieces of impervium/gift in a lot of builds.
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A long long time ago someone in game told me that having more endurance means you have more recovery too. His theory was that the time it takes to go from 0 endurance to max endurance is fixed, and implemented as a percentage of recovery per tick. I.e., if you gain 1% endurance per second, then it would take 100 seconds to go from 0 to your maximum of 100. But if your maximum was 105 or 110, it would still take 100 seconds to get to the max.
Another way to look at this is that gaining recovery is good (less total seconds), but gaining maximum endurance is even better. (I.e., more endurance gained per second, and higher endurance at the start of each fight.)
I've had no reason to doubt this theory, but I've also never had confirmation that it was true. Does anyone know for sure?
-- Rich
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